What substances should never be combined with psilocybin?

Lithium should be strictly avoided due to documented cases of seizures and cardiac events. MAOIs (including some antidepressants and harmaline in ayahuasca) carry severe serotonin syndrome risk. Tramadol, stimulants, and high-dose cannabis are also considered high-risk combinations. Alcohol worsens nausea and clouds judgment without benefit.

Is it safe to combine psilocybin with other psychedelics?

Combining psilocybin with other serotonergic psychedelics such as LSD creates an unpredictable and highly intensified experience that is difficult to manage even for experienced users. DMT combined with psilocybin similarly produces very rapid and overwhelming perceptual changes. Such combinations are generally advised against by harm-reduction organisations, especially for those without extensive prior experience.

What are the safest supplements to take alongside a psilocybin microdose?

Lion's mane mushroom, magnesium glycinate, and omega-3 fatty acids are commonly used alongside microdoses with a reasonable safety profile. Niacin (as in the Stamets Stack) is widely used but can cause discomfort. Always introduce supplements one at a time, avoid serotonergic compounds (5-HTP, St John's Wort) within 24 hours of dosing, and consult a healthcare provider if you take prescription medications.

Drug Combinations & Interactions

Understanding Drug Interactions

Psilocybin can interact with various substances in ways that may be dangerous, reduce effectiveness, or cause unexpected effects. Understanding these interactions is essential for harm reduction.

Dangerous Lower Risk Medications Supplements

⛔ Dangerous Combinations

Combinations that should be avoided due to serious health risks including serotonin syndrome, cardiovascular issues, or psychological crisis.

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✅ Lower-Risk Combinations

Combinations that have relatively lower risk profiles based on available evidence and harm reduction guidelines.

View Guide

Medication Interactions

Important information about how psilocybin interacts with prescription and over-the-counter medications.

💊 Drug Interactions

Comprehensive guide to medication interactions including SSRIs, MAOIs, lithium, and other commonly prescribed drugs.

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⚠️ Critical Warning: SSRIs & MAOIs

SSRIs (like Prozac, Zoloft, Lexapro) can significantly reduce psilocybin effects and may cause serotonin syndrome in some cases. MAOIs can dramatically intensify and prolong effects, creating dangerous situations. Never stop psychiatric medications without medical supervision.

Supplement Stacking

Information about combining psilocybin with supplements for various purposes.

🧪 Stacking Supplements

Common supplement combinations used with microdosing including lion's mane, niacin, and other nootropics.

Learn About Stacking

📋 Stacking Protocols

Established protocols like the Stamets Stack and Fadiman Protocol with dosing guidelines.

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💡 Harm Reduction Principle

The safest approach is to use psilocybin on its own without combining it with other substances. If you choose to combine, research thoroughly, start with minimal doses, and never combine multiple substances for the first time.

Combinations by Substance

Looking for a specific substance? Below are dedicated guides covering the mechanism of interaction, harm-reduction guidance, and a medical disclaimer for each, grouped by risk level.

⛔ Dangerous — Avoid Entirely

Lithium MAOIs Tramadol

🚫 High Risk / High Complexity

Stimulants MDMA Cocaine Opioids Ketamine

⚠️ Use Caution

SSRIs Cannabis Alcohol Antipsychotics Beta-Blockers ADHD Medications

✅ Lower Risk

Caffeine CBD Benzodiazepines NSAIDs

Quick Reference

🚫 Avoid Combining With

MAOIs (dangerous)
Lithium (seizure risk)
Tramadol (serotonin syndrome)
High-dose stimulants
Alcohol (high doses)

⚠️ Use Caution With

SSRIs (reduced effects)
Cannabis (intensification)
Caffeine (anxiety)
Benzodiazepines (trip killer)